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Online Markdown Viewer

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Markdown online preview, step by step

  1. 1

    Type or load a file

    Paste Markdown, choose a local .md, .markdown, or README file, or load a publicly accessible raw Markdown URL.

  2. 2

    Check the live preview

    Edit the source and review GFM tables, task lists, code highlighting, math, the table of contents, and Mermaid diagrams.

  3. 3

    Export or keep editing

    Download the Markdown, export or print the sanitized preview, or create a private fragment-only link to share the current content.

Features Overview

Edit and read .md or README files online with live GFM, code block, math, and Mermaid previews, while all processing stays in your browser.

Tool Description

Open and preview .md and README files online with GFM, syntax highlighting, Mermaid, math, and local browser-only processing. No install or sign-up required.

Last updated

Capabilities Checklist

  • Supports GitHub Flavored Markdown, task lists, tables, footnotes, and autolinks.
  • Uses Shiki for code highlighting and includes one-click copy for code blocks.
  • Markdown to PDF: export via browser print, keeping the rendered layout.
  • Markdown to HTML: export a standalone single file.
  • Mermaid rendering online: flowcharts and sequence diagrams draw right in the preview.
  • Online editor: edit on the left, live preview on the right, drafts stay local.
  • Supports KaTeX math, table of contents, one-click formatting, Markdown download, and private fragment sharing.
  • Does not parse embedded HTML by default, reducing XSS risk during preview and export.

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Markdown Online Preview Guide: GFM, Mermaid, Math, and Privacy

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Preview README.md Online: Check GFM Before You Commit to GitHub

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Frequently Asked Questions

Which files can this reader load?
Select Load File to choose a .md, .markdown, README, or plain text file. You can also paste content or import a publicly accessible raw URL, and it renders in your browser immediately. To compare ways of opening .md files on Windows, macOS, and mobile, see the guide on how to open an .MD file.
Using this tool as a README viewer
It supports GitHub Flavored Markdown, including tables, task lists, strikethrough, autolinks, footnotes, and syntax-highlighted code blocks for reviewing README.md files.
Free access and account requirements for this online Markdown reader
Reading, editing, formatting, Mermaid, math, HTML export, PDF printing and share links are all free to use, and none of them require an account.
Where your content is processed and how share links work
Previewing, formatting, Mermaid rendering, and exports run locally in the browser. Share links store content after the URL # fragment, which browsers do not send to our server.
Which Markdown syntax is supported?
The reader supports standard Markdown plus GFM tables, task lists, strikethrough, autolinks, footnotes, fenced code blocks, Mermaid diagrams, and KaTeX math.
Writing Mermaid diagrams that render in the preview
Create a fenced code block with the mermaid language and enter the diagram syntax. The preview renders the SVG locally with Mermaid strict security mode.
Exporting Markdown to PDF and HTML
Use Print or Save PDF to open the browser print dialog and choose Save as PDF, or export the standalone HTML and print it later.
The reason inline HTML is not rendered by default
Embedded HTML increases XSS risk. The tool shows raw HTML as text by default to avoid executing untrusted content during preview or export.